Blade Runner is set in a future Los Angeles (2019) when wealthy people have abandoned the earth for other worlds leaving only the poor and depressed behind. Androids, called Replicants have been created to perform tasks for humans but they became too advanced and were banned from the earth. Four have escaped and made their way to earth. Harrison Ford stars as Rick Deckard a special sort of policeman called a Blade Runner whose task it is to terminate the Replicants.
To read a simple but interesting commentary on the film’s storyline go here.